Micrometer having a nonrotatable spindle



May '11, 1948. w. A. GRIBBLE 2,441,317

MICROMETER HAVING A NONROTATABLE SPINDLE Fi led Dec. 2, 1944 I WZL4/4H A. 69/66Lf INVENTOR.

Patenieci May 11 1948 'bF'FiCE 525mm}: v ltncitditin' rsanimeimeitiibwimsm 'SPINDLE William A. Los Axiele's, Calif, 'oflnne-half to Charles Libman, LosAngeles,

fit'l ij rm vbf e fr n e nd. a trim at m unt d n the iii iandgt s e g t thre e .fiiiimfie b th' tf il' ii ilefl m m er ,V SfttQ a i fl to rditr e ork qn.' iqt. i ..q .ii .fth inb it warme t lide w qui re t pn- "In. the i on f n. fri thi co 'vhtional mig ginetjer there is e..,fa

spin is, and a thimbl meantime 15a gthrea eliv mo tjd an the .tr 'mie nd ann a ion;

states t e spin inw d opfios tje a m of the frame with a -screwing action inv'o fg rotary ov men ithenii rometer s iu'sedit S hi 5 r. e am l' ,p a' ie' assassi at tend ts di v i eseth p f e' s J st is. me sa e it an enesis r ingans fo th mm s m me er he ein the th eaded vir zni, er

which {c'orresponus to the conve tional sp ndle s h l against wta iQnJand is r y e e to. slidei elative to the frame Y rotation 'of thimble this die' n j 'ct i v l e'd...th n? ammg accurate measurements tobe obtained in measuring relatively soft materials.

Another object of the invention is to provide an improved micrometer having the above-mentioned characteristics whichisof relatively simple and highly durable construction a which has in the appended claims, reference is had to the accompanying drawings for an illustrative embodiment of the invention, wherein:

Figure 1 is a front view in elevation of the micrometer embodying the present invention;

Fig. 2 is a view in side elevation of the same, parts being broken away and illustrated in vertical section, the position of the parts being shown in fully open position;

Fig. 3 is a view similar to Fig. 2, but illustrating the micrometer in a position wherein the thickness of a piece of work is being measured; Fig. 4 is a section view taken substantially upon the line 4-4 upon Fig. 2; and

Fig. 5 is a sectional view taken substantially upon the line 5-5 upon Fig. 1.

m a th cknesses of r la v sQitmatenms.

2, 1944, Serial No. 566,323

Referring 110 the egiifidii "ti'lyiii'g g rawm'gs w ere n similar eference characters designate s milar arts thr'oii out, the "imprpveu 4 inioi'oiiieter'e'omp 's'afiap'd ffaii'ie I'll oi ifojfieaj r'in '5 or which fei'sfi stationary "race H and "on whihth''rieiis'aihovable face P tire-n eces: "WdrkW'Qisld'ebyirie'asiiriiig"the'distahcebetweenthe stations y, evasieraeee. Thfen'i able-race I: y be provided by "p'lug T3 sc ewedinto the end of a tubular threaded member l' l l favi'fig threads l5 intermediate the ends; thereof. These threads are preferably forty threads-per tfidug'n the chjof theithrads may be within tire tempt member "tast rs eeife z r t i tee n e; e

1 men an s thereof and ektendirig bstatntial ortion or'ijts engt i i .i te er d s at .!-J e,r... t frame and inhedfor'otherw erigidlysecured to the frame. The stem i6 is designed tofitjthe interior of the tubular member ,andthefeather s'l otle which extends ber l4 its en,-v

r. me ndfi s h t: e .4- A i fl i' i' xii 1 it e is. nl r 3 wh i fit -em W1 attemp t smel y th 1: a l. th thr o portion or the tubuiar member i4. Rme', ,2 i

it Whi 3 .12 sc n gths h hs ves tqretain nag 2.3 mttifi i et ie am 1 I. iv tqtli f b' to be held =1 aim e tit e: s...- I 'Ari be.

a V rmeaa'eti niernb'eii l will be caused toscrew out or in through the thimble and thus to be advanced or retracted with relation to the work W. The end of the thimble is preferably tapered as indicated at 26 and fits snugly around the outer end of the threaded member [4 which projects or extends therethrough. The tapered portion is graduated as indicated at 21 and the projecting portion of the threaded member is provided with a witness mark along which graduations 28 may be arranged. With the threads on the threaded member and thimble of a pitch of forty threads per inch, each complete revolution of the thimble will bring about a movement 55 of the movable face I2 of .025" and if the gradua the thimble can be determined by reading the graduations 28 exposed on the projecting end of the threaded member, or if desired, one of the pins 24 may be extended so as to engage with the teeth of a rotary toothed member 29 mounted on the frame 1 which carries a disc 30 on which graduations are formed and which are arranged 1 to traverse a pointer 3!.

On each revolution of the thimble 25, the extended pin 24 will advance the toothed member 29 oneturn and this, in

turn, advances the disc beneath the pointer 3i so that the number of revolutions can be read directly against the pointer. Y

From the above-described construction it will be appreciated that the improved micrometeris of relatively simple and durable construction and that in its use the movable face (2 is advanced toward the work W.withou t rotary or screwing action, Consequently, it will not tend to dig into the-work in the course or taking a measurement, but will be merely pressed thereagainst so as to ive an accurate indication of its thickness even though the work W is of relatively soft material. Various changes may be made in the details of construction without departing from the spirit and scope of the invention as defined by the appended claims.

I claim: v

1. A micrometer comprising a frame, a stem having a feather rigidly mounted on one arm of the frame, a slotted threaded member fitting about the stem and feather thereon, a thimble threadedly engaging the threaded member, and meansproviding a rotatable connection between the thimble and the frame whereby upon rotation of the thimble the threaded member may be caused to slide without rotation relatively to the frame. r V o a v 2, A micrometer comprising a frame, a stem having a feather rigidly mounted on Onearm of the frame, a slottedthreadedmember fitting about the stem and feather thereon, a thimble threadedly engaging the Y threaded member, a hub on the frame, a ringfpinn'ed to" thethimble rotatably disposed about the hub, and asecond ring pinned to the hub for maintaining the first mentioned ring against sliding'mov'ement relatively to the hub wherebyupon' rotation of the thimble the threaded member maybe advanced or retracted relatively to the frame without rotations 3. A micrometer comprising a frame, a stem having a feather rigidly mounted on one arm of the frame, a slotted threaded member fittin about the stem and feather thereon, a' thimble threadedly engaging the threaded member, a hub on the frame, a ring pinned to the thimble rdtatably disposed about the hub, and a second ring pinned to the hub for maintaining the first mentioned ring against sliding movement relatively to the hub whereby upon rotation of the thimble the threaded member may be advanced or retracted relatively to the frame without rotation, the threaded member extending through the thimble and having a. witness mark and graduations thereon and the thimble having raduations thereon.

4. A micrometer. comprising a frame, a stem having a feather rigidly mounted on one arm of the frame, a slotted threaded member fitting about the stem and feather thereon, a thimble threadedly engaging the threaded member, means providing a rotatable connection between the thimble and theframe whereby upon rotation of the thimble the threaded member may be caused to slide without rotation relatively to the frame, a toothed member mounted for rotation on the frame, and means on the thimble for rotating the toothed member one turn for each revolution of the thimble, and means for reading the number ofrotation's of the thimble on the toothed member.

5. A micrometer comprising a frame, a threaded member having a slidable but non-rotatable connection with one side of theifra'me, a thimble threadedly engaging the threaded member, said frame having a hub disposed about a portion of the threaded member presenting an external shoulder thereon, and a ring disposed about the hub between the shoulder and the frameand rigidly secured tothe interior of the thimble whereby upon rotation of the thimble the threaded member a may be advanced or retracted through the frame without rotating relatively thereto. V

6. A micrometer comprising a'C-shaped frame having a hub on the exterior of one arm thereof, a threaded member extending through said hub having a slidable but non-rotatable connection with the frame, a ring secured 'to the exterior of the hub, a thimble threadedly, engaging the threaded member, said thimble having a ring secured thereto rotatable about the hub against said ring on the hubowhereby on rotation of the thimble the threaded member may be advanced or retracted through the hub without rotating The following references are of record in the file of this patent: I

UNITED STATES PATENTS 1 Number Name 1 Date 1,295,936 Spellman Mar. 4, 1919 2,338,001

LaVigne' Dec. 28, 1943 

